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Cash, Cash Equivalents, and Investments (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
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Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017
Cash and Cash Equivalents [Abstract] |  |  |  |
Gross realized gains on sale of investments | $ 308,000 | $ 55,000 | $ 363,000 | $ 143,000
Gross realized losses on sale of investments | $ 61,000 | $ 13,000 | $ 94,000 | $ 36,000

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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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